RFR: 8370863: VectorAPI: Optimize the VectorMaskCast chain in specific patterns [v6]

[Eric Fang]

On Fri, 26 Dec 2025 11:10:07 GMT, Emanuel Peter <epeter at openjdk.org> wrote:

>> Eric Fang has updated the pull request incrementally with one additional commit since the last revision:
>> 
>>   Refine code comments
>
> I'll review this again in early January, once I'm back from Christnas/New Year break ;)

@eme64 I have addressed your comments, would you mind taking another look of this PR? Thanks~

-------------

PR Comment: https://git.openjdk.org/jdk/pull/28313#issuecomment-3808501474